启动Spring Boot应用程序时出现ClassCastException

Question

在启动我的spring启动应用程序时看到一个神秘的ClassCastException.我最近开始看到这个问题而没有任何配置的任何变化.我们如何调试此问题？

org.springframework.context.ApplicationContextException: Unable to start embedded container; 
nested exception is java.lang.ClassCastException: 
org.apache.tomcat.websocket.WsWebSocketContainer cannot be cast to io.undertow.websockets.jsr.ServerWebSocketContainer
at io.undertow.websockets.jsr.Bootstrap.handleDeployment(Bootstrap.java:62) ~[undertow-websockets-jsr-1.3.5.Final.jar:1.3.5.Final]
at io.undertow.servlet.core.DeploymentManagerImpl.handleExtensions(DeploymentManagerImpl.java:246) ~[undertow-servlet-1.3.5.Final.jar:1.3.5.Final]

信息: 这是构建信息

Answer 1

您不需要此依赖项.

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-undertow</artifactId>
   </dependency>

如果您打算使用tomcat服务器,则不需要任何tomcat依赖项,因为默认容器是Spring启动时的Tomcat.

<dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jsp-api</artifactId>
            <scope>provided</scope>
    </dependency>
    <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
    </dependency>

参考SpringBoot EmbeddedContainers